Group Delay difference between L and R with Eigentakt?

[pinebud]

Can group delay different for Left and Right channel? I got Apollon Eigentakt amp today, and wanted to measure the delay for subwoofer.

What I tried is as the following.
1. measure main woofer delay on 70-80Hz for Left and Right.
2. measure subwoofer delay on 70-80Hz (I have 1x subwoofer)
3. adjust delay for subwoofer to match with main woofer delay.

The problem is.. left channel and right channel have different delay value on 70-80 with my amplifer.. I didn't see this kind of different with other amplifiers..
I don't know what should I check. or how to understand this..

R delay : -13.0466 ms
L delay : -23.2128 ms

 

[pinebud]

R :
Delay -13.0466 ms (-4.475 m, -(14 ft 8.2 in))
using IR start time relative to Acoustic reference played from R with no timing offset
Clock adjustment: -35.4 ppm

L :
Delay -23.2128 ms (-7.962 m, -(26 ft 1.5 in))
using IR start time relative to Acoustic reference played from L with no timing offset
Clock adjustment: -35.3 ppm

 

[MaxwellsEq]

The problem is.. left channel and right channel have different delay value on 70-80 with my amplifer.. I didn't see this kind of different with other amplifiers

That absolutely can not be caused by the Purifi amplifier.

 

[-Matt-]

At 75 Hz the cycle period is 13.3ms. Check to see if your software is locking onto the next cycle over.

Alternatively if the polarity of one channel is inverted you could get half a period of eronious delay, 6.6ms. Try to check for that too.

 

[Avp1]

Can group delay different for Left and Right channel? I got Apollon Eigentakt amp today, and wanted to measure the delay for subwoofer.

What I tried is as the following.
1. measure main woofer delay on 70-80Hz for Left and Right.
2. measure subwoofer delay on 70-80Hz (I have 1x subwoofer)
3. adjust delay for subwoofer to match with main woofer delay.

The problem is.. left channel and right channel have different delay value on 70-80 with my amplifer.. I didn't see this kind of different with other amplifiers..
I don't know what should I check. or how to understand this..

R delay : -13.0466 ms
L delay : -23.2128 ms

Swap left and right channels in amplifier. If delays are the same - issue is with speakers (or their location). Also subwoofer delay does NOT need to be the same as for speakers in all cases. Sometimes you want to add delay up to full phase inversion in subwoofer channel to get the best sound in the room (this implies that speakers and subwoofer overlap each other in upper and mid-bass)

 

[Lars Risbo]

No, can’t be the amp. only way an analog amp could add delay is if it’s bandwidth is severely limited and even here we would measure it in micro seconds.